Z TORK Automation Co. is a leading manufacturers, supplier and exporter of Pilot Operated Piston Type Solenoid Valves in Ahmedabad, Gujarat, India. Pilot Operated Piston Type Solenoid Valve is a type of electromagnetically actuated valve used to control the flow of liquids or gases. It operates by using a small pilot solenoid valve to control the pressure above or below a piston, which then opens or closes the main valve. These valves are ideal for high pressure, high flow, or large diameter applications where direct-acting valves would require too much power.